package com.bwie.filter;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.annotation.Order;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.concurrent.TimeUnit;

/**
 * description:
 *
 * @Author zhaohaoyang
 * @Create 2025/7/3 21:57
 * @Version 1.0
 */
@Configuration
@Order(-1)
public class GlobalFilter implements org.springframework.cloud.gateway.filter.GlobalFilter {

    @Autowired
    StringRedisTemplate redisTemplate;

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {


        //获取请求参数
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        String url = request.getURI().getPath();
        System.out.println("请求路径：" + url);


        //设置白名单
        if (url.contains("/login")) {
            System.out.println("登录白名单");
            return chain.filter(exchange);
        }

        //获取token
        String token = request.getHeaders().getFirst("token");
        if (token == null || token.isEmpty()) {
            System.out.println("token不能为空" + url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        Claims body = Jwts.parser().setSigningKey("123456").parseClaimsJws(token).getBody();
        Integer userId = body.get("userId", Integer.class);
        String tokenKey = "token-" + userId;
        String redisToken = redisTemplate.opsForValue().get(tokenKey);

        if (redisToken == null || redisToken.isEmpty()) {
            System.out.println("token不能为空" + url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        if (!token.equals(redisToken)) {
            System.out.println("token不正确" + url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }


        redisTemplate.expire(tokenKey, 15, TimeUnit.MINUTES);

        System.out.println("放行" + url);

        return chain.filter(exchange);


    }


}
